CASIA OpenIR  > 毕业生  > 博士学位论文
Alternative TitleResearch on Wireless Passive Pressure and Temperature Sensors Based on Surface Acoustic Wave for Intelligent Tires
Thesis Advisor王飞跃
Degree Grantor中国科学院研究生院
Place of Conferral中国科学院自动化研究所
Degree Discipline控制理论与控制工程
Keyword智能轮胎 声表面波 无源无线 叉指换能器 反射器 压力传感器 Intelligent Tire Surface Acoustic Wave(Saw) Wireless Passive
Abstract智能轮胎是随着汽车工业的发展而出现的一种新型轮胎,它能够自动进行轮胎压力和温度等参数的测量,并根据测量结果对轮胎状态进行智能判断和决策。无源无线声表面波压力和温度传感器体积小、重量轻、精度和灵敏度高,非常适合智能轮胎的需要。本文在目前声表面波传感器研究的基础上,对应用于智能轮胎的无源、无线声表面波压力和温度传感器进行了研究。1、声表面波压力和温度传感器压电基片和切向的优化选择定义了压电基片的压力灵敏度系数和温度灵敏度系数,利用声表面波压电基片的压力灵敏度系数、温度灵敏度系数、有效声表面波耦合系数、功率流角以及传播损耗等特性参数定义了声表面波压力和温度传感器压电基片优化选择的目标函数,根据定义的目标函数,在不同旋转角度 X , Y 和 Z 切的石英、铌酸锂和钽酸锂压电基片中,解决了基于声表面波延迟线的压力和温度传感器的压电基片和切向的最优选择问题和基于声表面波谐振器的压力和温度传感器的压电基片和切向的最优选择问题,为声表面波传感器压电基片的选择提供理论依据。2、声表面波压力和温度传感器的等效电路模型把叉指换能器的实际电场分布近似为纵横场交替的一维场分布,分别建立了横场和纵场分布的等效电路模型,在此基础上建立了叉指换能器的改进等效电路模型。根据建立的叉指换能器的等效电路模型建立了反射器的等效电路模型,在叉指换能器和反射器等效电路模型的基础上建立了声表面波延迟线和单端对声表面波谐振器的等效电路模型。在前面分析和求解的基础上,分别建立了基于声表面波延迟线的压力和温度传感器的等效电路模型和基于声表面波谐振器的压力和温度传感器的等效电路模型。
Other AbstractThe intelligent tire is a new type tire originated from the development of automobile industries. It can measure the tire pressure, temperature and other parameters initiatively and make decision of tire state intelligently according to the measurement. The wireless passive pressure and temperature sensor based on surface acoustic wave(SAW) is very small, light, sensitive and suitable for the intelligent tire. Based on the research results of SAW sensors in present, this paper researched the wireless passive SAW-based pressure and temperature sensor for intelligent tires in six parts. 1. Optimal Selection of Piezoelectric Substrates and Crystal Cuts for SAW-Based Pressure and Temperature Sensors A perturbation method is used to determine the velocity shift of SAW caused by variations in surface pressures and temperatures of piezoelectric substrates. Effects of pressures and temperatures on elastic, piezoelectric and dielectric constants of piezoelectric substrates, as well as initial stresses and boundary conditions, are fully considered in the solution process. The pressure and temperature sensitive coefficients are defined. An objective function for evaluating the performance of piezoelectric substrates is defined by considering their effective SAW coupling coefficients, power flow angles, acoustic propagation losses, and pressure and temperature sensitive coefficients. Optimal selection of piezoelectric substrates and crystal cuts for X -cut, Y -cut, Z -cut quartz, lithium niobate and lithium tantalite crystals are achieved by evaluating their objective functions for various pressure, temperature or pressure/temperature sensors based on SAW resonators or SAW delay lines.
Other Identifier200218014603183
Document Type学位论文
Recommended Citation
GB/T 7714
张向文. 应用于智能轮胎的无源无线声表面波压力和温度传感器研究[D]. 中国科学院自动化研究所. 中国科学院研究生院,2005.
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